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A thresher shark uses its unusual tail fin for swimming and hunting.
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The Thrashing Thresher Shark

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Whip coral gobies live on coral reefs throughout the Indo-Pacific, where they are found on a single species of coral: black wire coral.
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Whip Coral Goby Portrait

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A deep-sea octopus protecting her eggs
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Vigilant Octomom

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A photo of a sea walnut, a ctenophore.
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Sea Walnut (Mnemiopsis leidyi)

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A rendering of an ocean scene as it may have looked 65 million years ago, when an astroid fell to Earth and triggered a mass extinction event.
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Cretaceous-Paleogene Boundary (65 Million Years Ago)

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Paleobiologist Mark D. Uhen drills away rock to reveal the fossilized bones of Peruvian archaeocetes (ancient whales), in the Vertebrate Paleontology Department at the Museo de Historia Natural de San Marcos. Uhen is a professor at George Mason Univer
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Preparing a Fossil Whale Specimen

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“I took this photograph of spinner dolphins in calm waters off the Ogasawara Islands, an archipelago in the Pacific Ocean about 600 miles south of Tokyo. When the sun briefly broke through the clouds, our shadow was mirrored in the water’s surface—an
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Spinner Dolphins Ogasawara Island, Tokyo, Japan

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This bait ball shows how small fish can react when larger predators are near, gathering tightly together in a ball-like formation that exposes the least number of fish.
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Bait Ball

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A Pontoh pygmy seahorse
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How Many Seahorse Species?

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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

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Polar bears have evolved to survive in the Arctic.
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Polar Bear on the Ice

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“In the upper left of this image I can visualize the profile of Pele, the fire goddess of Hawaiian folklore, as if she is whispering to the sea.” -- Nature's Best photographer, Peter Lik.Equipment Used to Capture the Shot: Canon EOS-1Ds Mark III; 5
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Kilauea Volcano, Kalapana, Hawaii, USA

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